Hmmm. Since this is cha-cha, I am doubting that it's an exposure problem. I believe Wim uploads his images as anaglyphs, and the Phereo viewer engine must decode it to black and white for side-by-side viewing. I am guessing that the decoding process is perhaps the problem. Another of Wim's images has the same problem...
http://phereo.com/image/59d744f6e7e5643a46000198
I think it's related to decoding red and cyan content in the original image. It's quite noticeable on the character's suit, and the emblem on the suit. The cha-cha camera shouldn't change exposure so much between shots.
That's my best guess anyway.